[AsmParser] Mnemonic Spell Corrector
This implements suggesting other mnemonics when an invalid one is specified,
for example:
$ echo "adXd r1,r2,#3" | llvm-mc -triple arm
<stdin>:1:1: error: invalid instruction, did you mean: add, qadd?
adXd r1,r2,#3
^
The implementation is target agnostic, but as a first step I have added it only
to the ARM backend; so the ARM backend is a good example if someone wants to
enable this too for another target.
Differential Revision: https://reviews.llvm.org/D33128
llvm-svn: 307148
diff --git a/llvm/lib/Target/ARM/AsmParser/ARMAsmParser.cpp b/llvm/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
index 891b5c6..1731dbe 100644
--- a/llvm/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
+++ b/llvm/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
@@ -8992,6 +8992,8 @@
return PlainMatchResult;
}
+std::string ARMMnemonicSpellCheck(StringRef S, uint64_t FBS);
+
static const char *getSubtargetFeatureName(uint64_t Val);
bool ARMAsmParser::MatchAndEmitInstruction(SMLoc IDLoc, unsigned &Opcode,
OperandVector &Operands,
@@ -9085,9 +9087,13 @@
return Error(ErrorLoc, "invalid operand for instruction");
}
- case Match_MnemonicFail:
- return Error(IDLoc, "invalid instruction",
+ case Match_MnemonicFail: {
+ uint64_t FBS = ComputeAvailableFeatures(getSTI().getFeatureBits());
+ std::string Suggestion = ARMMnemonicSpellCheck(
+ ((ARMOperand &)*Operands[0]).getToken(), FBS);
+ return Error(IDLoc, "invalid instruction" + Suggestion,
((ARMOperand &)*Operands[0]).getLocRange());
+ }
case Match_RequiresNotITBlock:
return Error(IDLoc, "flag setting instruction only valid outside IT block");
case Match_RequiresITBlock: